Your cart is empty error

Hi
User can add item to cart
https://nimbus.everhelper.me/client/notes/share/481293/ry1m0u0dyesvcsixzll3

but when going to cart or checkout the messages states
https://nimbus.everhelper.me/client/notes/share/481294/o4ga3037zrzy0d0lskip

Any help please on why this is happening?, As can bee seen the poup shows that 7 items have been added to cart

Thanks
Iain